Brush-holder for dynamo-electric machines.



A. N. SAMMARONE. BRUSH HOLDER FOR DYNAMO ELECTRIC MACHINES.

AFPLIOATION FILED OUT. 31, 1913.

Patented June 30, 1914.

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or bent will be provided with apart for at taching the brush-holder to the usual sup porting stud and provided with ways in which is slidably mounted an ordinary carbon brush, the portion which supports the sliding ways for the brush being-provided with crossbar on which is mounted a re numerals indicate like parts in the dili erent figures, Figure 1, is a view of a blank stamped from a piece of sheet metal from which the brusli-liol(le1"is fashioned; Fig. 2, is a vertical central sectional view of the device embodying this invention on line ri 1i of .lfig. 3; and, Fig. 3, is a plan view or the device.

Referring to the drawings in detail, the

reference numeral 1 denotes gei'ierally a blank of sheet metal fashioned in the form 'ot a cross having a vertical portion 2 and side wings l and 4 and a depending portion 5. The vertical. poi-lion 2 is provided with an aperture 6 and the depending portion with a threaded aperture 7 and the side wings 3 and with apertures 8.

in pra tice, the vertical portions 2 and 5 are bent into annular iorn'iation as shown at 9 in Fig. A lhuinb screw 10 is employed or v,-la1r1pir1g this portion about the ordinary supporting stud 11 used for sustaining brusli-liolders. Ellie side wings '3 and 4 are bent so" as to lie parallel as shown in Fig. 3 and with their free ends laterally bent M312, and with the ad acent portion 13 bentto lie'in'a' plane parallel with the axis of thestud i li l he extreni'eends of the wings are bent toward each other ill? 14 toilie par allel' with the bent portion l-2. ll'iepentire conformation oi the enclsofbh'e wiiigs 3 and tie such as to fornr a slide or brush-holder .to receive a carbon brush 15 thelower face of which is adapted to engage on the face of the commutator l6.

Extending between the openings 8 in the lateral portions 8 and i ,is a cross-bar 17 which serves to hold the members 3 and 4c in parallelism. the brush 15 is a cap 18 provided with an upturned-lip Mounted on the crossbar 17 are a plurality ofcoiled resilient elements 20. One end 21 of each. of these resilient elements is provided with a hook adapted to engage the lip 19 and the opposite end 22 thereof is arran 'ed to engage in one or" a plurality of notches 23 formed in'the 11 )per faces of the members 8 and 4 and by shi. ting the position of the end 22 of either of the springs the tension on the resilient element is increased or diminished at will. Secured to one of the wings 3 or 4 is an electrical conductor 2% which extends to and connects with the cap 18 for transmitting an electrical current from the stud 11 to the brush.

It will be obvious that by forming the entire.brush-holder of a single piece of metal a great reduction in the expense of manufacturing brush-holders is accomplished, and a greater rigidity of the brush-holder 's secured. Furthermore, the device an ds a simple and efiective device for ho ding brushes to ptillllt the brush to be alined with respect to the axis or". the commutator and yet permit free sliding vertical more meat of the brush in the holder. Furthermore, by providing the coiled resilient elements 17 on the cross-bar 20 and with their ends engaging the lip 19 of the cap 18 and also engaging the notches 23 a desired Mounted on the upper end of .lOO

fashioned into an annular collar or sleeve for engagement with a supporting stud, the blank further provided With lateral wings fashioned to be extended in parallelism, the ends of said wings being bent away from each other in parallel lines to form a slide or brush-holding element, a brushmounted in said slides, a cap on said brush, a cross-bar extending between the parallel portions of said Wings, and a coiled resilient element mounted on said cross-bar and engaging the cap and one Wing for forcing the brush into engagement with a commutator.

2. A commutator brush-holder formed in.- tegrally of a single piece of stamped metal cruciform in shape with the central portion thereof fashioned into an annular collar or sleeve for engagement with a supporting stud, a clamping member to clamp said sleeve or collar about said stud, the cross pieces of the device extending forwardly in parallelism, a bar extending hetweer said portions, the ends of said portions being fashioned into approximately a U-shaped form, the open ends thereof opposing each other to constitute a slide or holding element for a brush, a brush mounted in said slide, a cap on said brush, a coiled resilient element on said cross bar engaging one of the cross pieces of said device and the brush for forcing the latter into engagement with the commutator.

In testimony whereof I have hereunto set my hand in presence of two subscribii'ig witnesses.

l-Vitnesses C. E, Hmirnn'y, A. L. ltloCninroon. 

